Preprocessor macro that inserts another preprocessor macro

Question

Is there a way to insert preprocessor macro using another preprocessor macro?

Can I do something like, for instance

    #define INSERT_MACRO(x) {#ifdef MYFLAG x; #endif}

so that when I write

    INSERT_MACRO(foo(););

it is converted to

    #ifdef MYFLAG
    foo();
    #endif

? Thanks!

Eric · Accepted Answer · 2016-01-15 18:26:32Z

1

You cannot use another preprocessor directive in define. Instead you may consider,

#ifdef MYFLAG
#define INSERT_MACRO(x) x;
#else
#define INSERT_MACRO(x) 
#endif

answered Jan 15, 2016 at 18:26

Eric

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